Process of producing plaque etchings



FebQ17, 1931. A. A. FEINBERG PROCESS OF PRODUCING PLAQUE ETCHINGS Filed July 5. 1929 2 Sheets-Sheet l v Feb. 17, 1931. A. A. FEINBERG PROCESS OF PRODUCING PLAQUE ETCHIN GS Filed July 5, 1929 2 Sheets-Sheet 2 Patented Feb. 17, 1931 TATS P ALBERT A. FEINBERG, OF IVJIINN'IEAEOLIS, MINNESOTA, ASSIGNOR TO BUREAU OF EN- GRAVING, INCL, OF MINNEAPOLIS, MINNESOTA, A CORPORATION OF MINNESOTA PROCESS OF PRODUCING PLAQUE ETCHINGS Application filed July 5,

My invention relates to the producing of a plaque etching that closely simulates etching that is a replicate of an etched plate'and provides a novel process of making a mold from the etched plate in which the plaque etching is cast.

In the accompanying drawings, which illustrate the invention, like characters inclicate like parts throughout the several views.

Referring to the drawings:

Fig. 1 is a perspective View of an etched plate;

Figs. 2 to 6, inclusive, illustrate the different steps in the process; and Fig. 7 is a face view of the plaque etching. It is thought that the invention will be best understood by a description of the different steps in carrying out the novel process- First step: In carrying out the novel proc- 2 ess an etched plate 8 is made in the customary and Well known manner of the subject to be reproduced on the plaque etching.

Second step: In mounting the etched plate 8 in a frame 9 having in its back a rabbeted seat for said plate and in applying a backing 10 to said plate by filling the frame 9 back of the plate 8 flush with a plastic material and allowing the same to set to rigidly secure the etched plate 8 in the frame 9, said frame, as shown, being has-relief.

Third step: In placing the etched plate 8 and frame 9 in a flask 11, of such dimensions that the sides of the flask 11 are spaced from the frame 9 and above the same, see Fig. 3, in filling the flask 11 with a plastic molding material 12, allowing the same to set to form a negative mold 13 from said plate and frame, and in removing the mold 13 from the flask 11 and the etched plate 8 and frame 9 from said mold. This molding material 12 is preferably gelatine glue or other suitable material which when set is elastic so that the mold 13 will readily part from the etched plate 8 and frame 9 when removing the same therefrom.

4 Fourth step: In placing the mold 13 in a second flask 1 1 with its impression face uppermost, said flask being of such dimensions that its sides are spaced from the marginal edges of the mold 13 and above the same, see

' Fig. 4, in filling the mold 13 with a plastic .rial to give the same an effect that closely Serial No. 376,224.

molding material 15, allowing the same to set to form a positive master mold 16 and in removing the mold 13 from the flask 14 and the master mold 16 from said mold 13. The plastic material 15 may be of any suitable material such as plaster-of-Paris or a composition having a similar base.

Fifth step In retouching the positive master mold 16 to remove imperfections, deepen scratches or furrows.

Sixth step: In filling the positive master mold 16 with a plastic molding material 17, allowing the same to set to form a negative mold 18 and thereafter removing the negative mold 18 from the positive master mold 16. The plastic material 17 is preferably glue or other suitable material that is elastic when set, to cause the same to part with the master mold 16 when removing the same therefrom.

Seventh step: In filling the negative mold 18 with a plastic material 19, allowingthe same to set to form a plaque etching 20 and its frame 21, which it integral therewith, and thereafter removing the framed plaque etching 20 from said mold 18.

The last or final step in the improved process is in filling the scratches or furrows in the plaque etching 20 with a coloring mateso simulates etching. The etched plaque may then be painted with Water colors or other Wise finished and given a coat of neutral lacquer. A further important reason for making the negative molds 13 and 18 of elastic materials is to permit the fine featherlike vanes, formed thereon by the scratches or furrows in the etched plate 8 and master mold 16 which are in has-relief, to be readily withdrawn from said scratches or furrows without breaking or damaging the same.

7 A relatively large number of plaque etchings may be made from the positive mold 18 and at the end of the life thereof another negative mold 17 may be made from the master mold 13. The plaque etchings may be made in Various different sizes, shapes, and forms, and the frame may be of various different styles or dispensed with entirely, 193

in which case the backing 10 may be secured to the etched plate 8 in any suitable manner.

What I claim is:

1. The process of making a plaque etching consisting first, in making an etched plate; second, in making a negative mold from said plate; third, in making a positive master mold from the negative mold; fourth, in making a negative mold from the positive master mold and finally in casting a plaque etching from the last noted negative mold, said negative molds being formed from a plastic molding material that is elastic when set to permit the fine feather-like vanes thereof formed in the scratches or furrows in the etched plate and positive master mold to be separated therefrom.

2." The process of making a plaque etching consisting first, in making an etched plate; second, in making a negative mold from said I late third in makin a )ositive master mold from the negative mold; fourth in retouching the positive master mold; fifth in making a negative mold from the positive master mold, and finally in casting a plaque etching from the last noted negative mold, said negative molds being formed from a plastic molding material that is elastic when set to permit the fine feather-like vanes thereof formed in the scratches or furrows in the etched plate and positive master mold to be separated therefrom.

3. The process of making a framed plaque etching consisting first, in making an etched plate; second, in placing the etched plate in a frame and securing the same thereto; third, in making a negative mold from said plate and frame; fourth, in making a positive master mold from the negative mold; fifth, in making a negative mold from the positive master mold, and finally in casting a framed plaque etching from the last noted negative mold, said negative molds being formed from a plastic molding material that is elastic when set to permit the fine feather-like vanes thereof formed in the scratches of furrows in the etched plate and positive master mold to be separated therefrom.

4. The process of making a framed plaque etching consisting first, in making an etched plate; second, in placing the etched plate in a frame and securing the same thereto; third, in making a negative mold from said plate and frame; fourth, in making a positive master mold fro-m tne negative mold; fifth, in retouching positive master mold; sixth in making a negative mold from the positive master mold, and finally in casting a framed plaque etching from the last noted negative mold, said negative molds being formed from a plastic molding material that is elastic when set to permit the fine featherlike vanes thereof formed in the scratches or furrows in the etched plate and positive master mold to be separated therefrom.

5. The process of making a framed plaque etching consisting first, in making an etched plate; second, in placing the etched plate in a rabbeted seat in the back of a frame and filling the frame back of said plate with a plastic material and allowing the same to set to hold the etched plate in the frame; third, in making a negative mold from the etched plate and frame; fourth, in making a positive master mold from the negative mold; fifth, in making a negative mold from the positive master mold, and finally in casting a framed plaque etching from the last noted negative mold.

6. The process of making a framed plaque etching consisting first, in making an etched plate second, in mounting the etched plate in a frame; third, in placing the etched plate and frame in a flask, in filling the flask with a plastic molding material and allowing the same to set to make a negative mold from the etched plate and frame, said material being elastic when set; fourth, in removing the negative mold from the flask and the etched plate and frame from the negative mold, placing the negative mold in a second flask with its impression face uppermost, in filling the second flask with plaster in plastic form and allowing the same to set to form a positive master mold; fifth, in filling the master mold with a plastic molding material to make a negative mold and allowing the same to set, said material being elastic when set; sixth, in filling the last noted negative mold with plaster in plastic form and allowing the same to set to form a framed plaque etching.

In testimony whereof I afliX my signature.

ALBERT A. FEINBERG. 

